Roxie Hunt, a hairstylist from Seattle, helped spearhead the eye-catching look and insists women should embrace their underarm hair rather than feeling forced to shave it off or hide it.

“It's no secret that some of us choose not to shave or wax our pits,” she wrote in a blog post for Off Beat Home.

“More and more often, I am meeting women who unapologetically choose not to succumb to the societal pressure of scraping a razor against the soft skin of their bodies. If you recall, I want to celebrate pit hair.”

Roxie asked a pal at the salon to help her test out the best armpit dying technique and offered a wealth of tips and advice to any women wanting to try out the trend for themselves.

Purple, blue and pink are popular go-to colours for those experimenting with the trend

“I have always wanted to colour someone's pit hair... I asked my co-worker Rain if she would be down to let me dye her pit hair blue to match her hair colour and she agreed, heartily,” she wrote.

“I began by mixing bleach and 30 volume developer. I knew I needed something strong enough to cut through that coarse hair and lighten it up as much as possible, but I didn't want to use 40 volume because I didn't want to cause any uncomfortable burning on the delicate skin in her pits.

“First, I had Rain wipe her pits down to remove any deodorant that might be lingering.

“Then, I got right in there with my bleach and colour brush, applying it thick in small sweeping strokes in all directions, making sure to fully cover every hair.”